Abstract
A traffic simulator called STREET was developed to test whether safety systems perform as designed and evaluates how well safety systems reduce traffic accidents. STREET was composed so as to reproduce traffic flows on road networks and to simulate traffic accidents caused by "human error" in a driver's behaviour. In validation of STREET, its simulated traffic flows almost entirely agree with actual ones. It is confirmed that STREET could evaluate the performance of safety systems and the effectiveness of safety systems for traffic accident reductions. For the covering abstract see ITRD E134653.